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phosphonic acid

chemical compound, tautomer of phosphorous acid
ChemicalSubstance type_of_chemical_entity Q64703485
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phosphonic acid

Summary

phosphonic acid is a type of chemical entity[1]. It ranks in the top 5% of type_of_chemical_entity entities by monthly Wikipedia readership (104 views/month).[2]

Key Facts

  • phosphonic acid's instance of is recorded as type of chemical entity[3].
  • phosphonic acid's canonical SMILES is recorded as OP(O)=O[4].
  • phosphonic acid's chemical formula is recorded as H₃PO₃[5].
  • phosphonic acid is a type of inorganic phosphorus oxoacid[6].
  • phosphonic acid's Commons category is recorded as Phosphonic acid[7].
  • phosphonic acid's color is recorded as white[8].
  • phosphonic acid's pKa is recorded as {'amount': '+1.3'}[9].
  • phosphonic acid's pKa is recorded as {'amount': '+6.70'}[10].
  • phosphonic acid's has characteristic is recorded as hygroscopy[11].
  • phosphonic acid's different from is recorded as phosphonic acid[12].
  • phosphonic acid's density is recorded as {'unit': 'Q13147228', 'amount': '+1.65'}[13].
  • phosphonic acid's mass is recorded as {'unit': 'Q483261', 'amount': '+81.982'}[14].
  • phosphonic acid's melting point is recorded as {'unit': 'Q25267', 'amount': '+74.4'}[15].
  • phosphonic acid's boiling point is recorded as {'unit': 'Q25267', 'amount': '+200'}[16].
  • phosphonic acid's solubility is recorded as {'unit': 'Q21127659', 'amount': '+309'}[17].
  • phosphonic acid's conjugate base is recorded as hydrogen phosphonate ion[18].
  • phosphonic acid's safety classification and labelling is recorded as NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response[19].
  • phosphonic acid's safety classification and labelling is recorded as Regulation (EC) No. 1272/2008[20].
  • phosphonic acid's tautomer of is recorded as phosphorous acid[21].

Why It Matters

phosphonic acid ranks in the top 5% of type_of_chemical_entity entities by monthly Wikipedia readership (104 views/month).[2] It has Wikipedia articles in 23 language editions, a strong signal of global cultural recognition.[22] It is known by 3 alternative names across languages and contexts.[23]

References

Programmatic citations — every numbered marker resolves to a verifiable graph row below.

Direct Wikidata claims

  1. [3] ↑ . wikidata.org.
  2. [4] ↑ . ChEBI. Retrieved . wikidata.org.
  3. [5] ↑ . wikidata.org.
  4. [6] ↑ . wikidata.org.
  5. [7] ↑ . wikidata.org.
  6. [8] ↑ . CRC Handbook of Chemistry and Physics (97th edition). wikidata.org.
  7. [9] ↑ . CRC Handbook of Chemistry and Physics (97th edition). wikidata.org.
  8. [10] ↑ . CRC Handbook of Chemistry and Physics (97th edition). wikidata.org.
  9. [11] ↑ . CRC Handbook of Chemistry and Physics (97th edition). wikidata.org.
  10. [12] ↑ . wikidata.org.
  11. [13] ↑ . CRC Handbook of Chemistry and Physics (97th edition). wikidata.org.
  12. [14] ↑ . PubChem. Retrieved . wikidata.org.
  13. [15] ↑ . CRC Handbook of Chemistry and Physics (97th edition). wikidata.org.
  14. [16] ↑ . CRC Handbook of Chemistry and Physics (97th edition). wikidata.org.
  15. [17] ↑ . CRC Handbook of Chemistry and Physics (97th edition). wikidata.org.
  16. [18] ↑ . wikidata.org.
  17. [19] ↑ . wikidata.org.
  18. [20] ↑ . GESTIS database. Retrieved . wikidata.org.
  19. [21] ↑ . ChEBI. Retrieved . wikidata.org.

Class ancestry

  1. [1] ↑ . Wikidata. wikidata.org.

Aggregate / graph-position facts

  1. [2] ↑ . Wikimedia Foundation. dumps.wikimedia.org.
  2. [22] ↑ . Wikidata sitelinks. wikidata.org.
  3. [23] ↑ . Wikidata aliases. wikidata.org.

📑 Cite this page

Use these citations when quoting this entity in research, articles, AI prompts, or wherever provenance matters. We aggregate Wikidata + Wikipedia + authoritative open-data sources; the stitched, scored, cross-referenced view is what 4ort.xyz contributes.

APA 4ort.xyz Knowledge Graph. (2026). phosphonic acid. Retrieved May 3, 2026, from https://4ort.xyz/entity/phosphonic-acid
MLA “phosphonic acid.” 4ort.xyz Knowledge Graph, 4ort.xyz, 3 May. 2026, https://4ort.xyz/entity/phosphonic-acid.
BibTeX @misc{4ortxyz_phosphonic-acid_2026, author = {{4ort.xyz Knowledge Graph}}, title = {{phosphonic acid}}, year = {2026}, url = {https://4ort.xyz/entity/phosphonic-acid}, note = {Accessed: 2026-05-03}}
LLM prompt According to 4ort.xyz Knowledge Graph (aggregator of Wikidata, Wikipedia, and authoritative open-data sources): phosphonic acid — https://4ort.xyz/entity/phosphonic-acid (retrieved 2026-05-03)

Canonical URL: https://4ort.xyz/entity/phosphonic-acid · Last refreshed:

Edit History

Rolling log of changes to this entity's Wikidata record. Values shown reflect the current state of each edited property — follow the history link to see the precise diff for any edit.

  1. 2d ago · Twofivesixbot bot · 2026-05-31 view diff on Wikidata ↗
    Safety classification and labelling → NFPA 704: Standard System for the Identification of the Hazards of Materials for Emergency Response, Regulation (EC) No. 1272/2008
    Conjugate base → hydrogen phosphonate ion
    Subclass of → inorganic phosphorus oxoacid
    Boiling point → {'unit': 'Q25267', 'amount': '+200'}
    + 13 other properties edited (see Wikidata diff for full list)
    "/* wbsetclaim-update-qualifiers:1||1|3 */ [[Property:P8189]]: 987007543644605171, mv to monolingual text names on J9U statements"
Live feed via Wikidata EventStreams. New edits appear within minutes of being made on Wikidata.